<!-- Original:   -->
<!-- Funciones de Validación de Fecha-->

// Version de Brouser
var isNav4 = false, isNav5 = false, isIE4 = false
var strSeperator = "/"; 

// If you are using any Java validation on the back side you will want to use the / because 
// Java date validations do not recognize the dash as a valid date separator.
var vDateType = 3; // Global value for type of date format
//                1 = mm/dd/yyyy
//                2 = yyyy/dd/mm  (Unable to do date check at this time)
//                3 = dd/mm/yyyy
var vYearType = 4; //Set to 2 or 4 for number of digits in the year for Netscape
var vYearLength = 2; // Set to 4 if you want to force the user to enter 4 digits for the year before validating.
var err = 0; // Set the error code to a default of zero
if(navigator.appName == "Netscape") {
if (navigator.appVersion < "5") {
isNav4 = true;
isNav5 = false;
}
else
if (navigator.appVersion > "4") {
isNav4 = false;
isNav5 = true;
   }
}
else {
isIE4 = true;
}
function DateFormat(vDateName, vDateValue, e, dateCheck, dateType) {
vDateType = dateType;
// vDateName = object name
// vDateValue = value in the field being checked
// e = event
// dateCheck 
// True  = Verify that the vDateValue is a valid date
// False = Format values being entered into vDateValue only
// vDateType
// 1 = mm/dd/yyyy
// 2 = yyyy/mm/dd
// 3 = dd/mm/yyyy
//Enter a tilde sign for the first number and you can check the variable information.
//if (vDateValue == "~") {
//alert("AppVersion = "+navigator.appVersion+" \nNav. 4 Version = "+isNav4+" \nNav. 5 Version = "+isNav5+" \nIE Version = "+isIE4+" \nYear Type = "+vYearType+" \nDate Type = "+vDateType+" \nSeparator = "+strSeperator);
//vDateName.value = "";
//vDateName.focus();
//return true;
//}
var whichCode = (window.Event) ? e.which : e.keyCode;
// Check to see if a seperator is already present.
// bypass the date if a seperator is present and the length greater than 8
if (vDateValue.length > 8 && isNav4) {
if ((vDateValue.indexOf("-") >= 1) || (vDateValue.indexOf("/") >= 1))
return true;
}
//Eliminate all the ASCII codes that are not valid
//var alphaCheck = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/-";
//if (alphaCheck.indexOf(vDateValue) >= 1) {
//if (isNav4) {
//vDateName.value = "";
//vDateName.focus();
//vDateName.select();
//return false;
//}
//else {
//vDateName.value = vDateName.value.substr(0, (vDateValue.length-1));
//return false;
 //  }
//}
if (whichCode == 8) //Ignore the Netscape value for backspace. IE has no value
return false;
else {
//Create numeric string values for 0123456789/
//The codes provided include both keyboard and keypad values
var strCheck = '47,48,49,50,51,52,53,54,55,56,57,58,59,95,96,97,98,99,100,101,102,103,104,105';
if (strCheck.indexOf(whichCode) != -1) {
if (isNav4) {
if (((vDateValue.length < 6 && dateCheck) || (vDateValue.length == 7 && dateCheck)) && (vDateValue.length >=1)) {
alert("Fecha Inválida. Por favor Reingrese el Dato");
vDateName.value = "";
vDateName.focus();
vDateName.select();
return false;
}
if (vDateValue.length == 6 && dateCheck) {
var mDay = vDateName.value.substr(2,2);
var mMonth = vDateName.value.substr(0,2);
var mYear = vDateName.value.substr(4,4)
//Turn a two digit year into a 4 digit year
if (mYear.length == 2 && vYearType == 4) {
var mToday = new Date();
//If the year is greater than 30 years from now use 19, otherwise use 20
var checkYear = mToday.getFullYear() + 30; 
var mCheckYear = '20' + mYear;
if (mCheckYear >= checkYear)
mYear = '19' + mYear;
else
mYear = '20' + mYear;
}
var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
if (!dateValid(vDateValueCheck)) {
alert("Fecha Inválida. Por favor Reingrese el Dato");
vDateName.value = "";
vDateName.focus();
vDateName.select();
return false;
}
return true;
}
else {
// Reformat the date for validation and set date type to a 1
if (vDateValue.length >= 8  && dateCheck) {
if (vDateType == 1) // mmddyyyy
{
var mDay = vDateName.value.substr(2,2);
var mMonth = vDateName.value.substr(0,2);
var mYear = vDateName.value.substr(4,4)
vDateName.value = mMonth+strSeperator+mDay+strSeperator+mYear;
}
if (vDateType == 2) // yyyymmdd
{
var mYear = vDateName.value.substr(0,4)
var mMonth = vDateName.value.substr(4,2);
var mDay = vDateName.value.substr(6,2);
vDateName.value = mYear+strSeperator+mMonth+strSeperator+mDay;
}
if (vDateType == 3) // ddmmyyyy
{
var mMonth = vDateName.value.substr(2,2);
var mDay = vDateName.value.substr(0,2);
var mYear = vDateName.value.substr(4,4)
vDateName.value = mDay+strSeperator+mMonth+strSeperator+mYear;
}
//Create a temporary variable for storing the DateType and change
//the DateType to a 1 for validation.
var vDateTypeTemp = vDateType;
vDateType = 1;
var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
if (!dateValid(vDateValueCheck)) {
alert("Fecha Inválida. Por favor Reingrese el Dato");
vDateType = vDateTypeTemp;
vDateName.value = "";
vDateName.focus();
vDateName.select();
return false;
}
vDateType = vDateTypeTemp;
return true;
}
else {
if (((vDateValue.length < 8 && dateCheck) || (vDateValue.length == 9 && dateCheck)) && (vDateValue.length >=1)) {
alert("Fecha Inválida. Por favor Reingrese el Dato");
vDateName.value = "";
vDateName.focus();
vDateName.select();
return false;
         }
      }
   }
}
else {
// Non isNav Check
if (((vDateValue.length < 8 && dateCheck) || (vDateValue.length == 9 && dateCheck)) && (vDateValue.length >=1)) {
alert("Fecha Inválida. Por favor Reingrese el Dato");
vDateName.value = "";
vDateName.focus();
return true;
}
// Reformat date to format that can be validated. mm/dd/yyyy
if (vDateValue.length >= 8 && dateCheck) {
// Additional date formats can be entered here and parsed out to
// a valid date format that the validation routine will recognize.
if (vDateType == 1) // mm/dd/yyyy
{
var mMonth = vDateName.value.substr(0,2);
var mDay = vDateName.value.substr(3,2);
var mYear = vDateName.value.substr(6,4)
}
if (vDateType == 2) // yyyy/mm/dd
{
var mYear = vDateName.value.substr(0,4)
var mMonth = vDateName.value.substr(5,2);
var mDay = vDateName.value.substr(8,2);
}
if (vDateType == 3) // dd/mm/yyyy
{
var mDay = vDateName.value.substr(0,2);
var mMonth = vDateName.value.substr(3,2);
var mYear = vDateName.value.substr(6,4)
}
if (vYearLength == 4) {
if (mYear.length < 4) {
alert("Fecha Inválida. Por favor Reingrese el Dato");
vDateName.value = "";
vDateName.focus();
return true;
   }
}
// Create temp. variable for storing the current vDateType
var vDateTypeTemp = vDateType;
// Change vDateType to a 1 for standard date format for validation
// Type will be changed back when validation is completed.
vDateType = 1;
// Store reformatted date to new variable for validation.
var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
if (mYear.length == 2 && vYearType == 4 && dateCheck) {
//Turn a two digit year into a 4 digit year
var mToday = new Date();
//If the year is greater than 30 years from now use 19, otherwise use 20
var checkYear = mToday.getFullYear() + 30; 
var mCheckYear = '20' + mYear;
if (mCheckYear >= checkYear)
mYear = '19' + mYear;
else
mYear = '20' + mYear;
vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
// Store the new value back to the field.  This function will
// not work with date type of 2 since the year is entered first.
if (vDateTypeTemp == 1) // mm/dd/yyyy
vDateName.value = mMonth+strSeperator+mDay+strSeperator+mYear;
if (vDateTypeTemp == 3) // dd/mm/yyyy
vDateName.value = mDay+strSeperator+mMonth+strSeperator+mYear;
} 
if (!dateValid(vDateValueCheck)) {
alert("Fecha Inválida. Por favor Reingrese el Dato");
vDateType = vDateTypeTemp;
vDateName.value = "";
vDateName.focus();
return true;
}
vDateType = vDateTypeTemp;
return true;
}
else {
if (vDateType == 1) {
if (vDateValue.length == 2) {
vDateName.value = vDateValue+strSeperator;
}
if (vDateValue.length == 5) {
vDateName.value = vDateValue+strSeperator;
   }
}
if (vDateType == 2) {
if (vDateValue.length == 4) {
vDateName.value = vDateValue+strSeperator;
}
if (vDateValue.length == 7) {
vDateName.value = vDateValue+strSeperator;
   }
} 
if (vDateType == 3) {
if (vDateValue.length == 2) {
vDateName.value = vDateValue+strSeperator;
}
if (vDateValue.length == 5) {
vDateName.value = vDateValue+strSeperator;
   }
}
return true;
   }
}
if (vDateValue.length == 10&& dateCheck) {
if (!dateValid(vDateName)) {
// Un-comment the next line of code for debugging the dateValid() function error messages
//alert(err);  
alert("Fecha Inválida. Por favor Reingrese el Dato");
vDateName.focus();
vDateName.select();
   }
}
return false;
}
else {
// If the value is not in the string return the string minus the last
// key entered.
if (isNav4) {
isNav4 = true;
//vDateName.value = "";
//vDateName.focus();
//vDateName.select();
//return false;
}
else
{
isNav4 = false;
//vDateName.value = vDateName.value.substr(0, (vDateValue.length-1));
//return false;
         }
      }
   }
}
function dateValid(objName) {
var strDate;
var strDateArray;
var strDay;
var strMonth;
var strYear;
var intday;
var intMonth;
var intYear;
var booFound = false;
var datefield = objName;
var strSeparatorArray = new Array("-"," ","/",".");
var intElementNr;
// var err = 0;
var strMonthArray = new Array(12);
strMonthArray[0] = "Jan";
strMonthArray[1] = "Feb";
strMonthArray[2] = "Mar";
strMonthArray[3] = "Apr";
strMonthArray[4] = "May";
strMonthArray[5] = "Jun";
strMonthArray[6] = "Jul";
strMonthArray[7] = "Aug";
strMonthArray[8] = "Sep";
strMonthArray[9] = "Oct";
strMonthArray[10] = "Nov";
strMonthArray[11] = "Dec";
//strDate = datefield.value;
strDate = objName;
if (strDate.length < 1) {
return true;
}
for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++) {
if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1) {
strDateArray = strDate.split(strSeparatorArray[intElementNr]);
if (strDateArray.length != 3) {
err = 1;
return false;
}
else {
strDay = strDateArray[0];
strMonth = strDateArray[1];
strYear = strDateArray[2];
//CC351 06/04/2006 INICIO
var CaracteresValidos = "0123456789-./";
var temp;
for (var i=0; i<objName.length; i++) {
	temp = "" + objName.substring(i, i+1);
	if (CaracteresValidos.indexOf(temp) == "-1")
		return false;
	}
//CC351 06/04/2006 FIN
}
booFound = true;
   }
}
if (booFound == false) {
if (strDate.length>5) {
strDay = strDate.substr(0, 2);
strMonth = strDate.substr(2, 2);
strYear = strDate.substr(4);
   }
}
//Adjustment for short years entered
if (strYear.length == 2) {
strYear = '20' + strYear;
}
strTemp = strDay;
strDay = strMonth;
strMonth = strTemp;
intday = parseInt(strDay, 10);
if (isNaN(intday)) {
err = 2;
return false;
}
intMonth = parseInt(strMonth, 10);
if (isNaN(intMonth)) {
for (i = 0;i<12;i++) {
if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase()) {
intMonth = i+1;
strMonth = strMonthArray[i];
i = 12;
   }
}
if (isNaN(intMonth)) {
err = 3;
return false;
   }
}
intYear = parseInt(strYear, 10);
if (isNaN(intYear)) {
err = 4;
return false;
}
if (intMonth>12 || intMonth<1) {
err = 5;
return false;
}
if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1)) {
err = 6;
return false;
}
if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1)) {
err = 7;
return false;
}
if (intMonth == 2) {
if (intday < 1) {
err = 8;
return false;
}
if (LeapYear(intYear) == true) {
if (intday > 29) {
err = 9;
return false;
   }
}
else {
if (intday > 28) {
err = 10;
return false;
      }
   }
}
return true;
}
function LeapYear(intYear) {
if (intYear % 100 == 0) {
if (intYear % 400 == 0) { return true; }
}
else {
if ((intYear % 4) == 0) { return true; }
}
return false;
}

// Handy, to convert dates to english format in order to do comparisons easier
function ConvDate(to) {
	var mDay = to.value.substr(0,2);
	var mMonth = to.value.substr(3,2);
	var mYear = to.value.substr(6,4);
	return mMonth + "/" + mDay + "/" + mYear;
}

function doDateCheck(to) {
today = new Date();
Date.parse(today.value);
if ((vardate=today - Date.parse(ConvDate(to))) >= 0 ) {
return true;
}
else {
alert("La fecha Hasta no debe ser mayor a la de Hoy");
to.focus();
to.select();
return false;
   }
}
function CompareDate(from, to) {
if (Date.parse(ConvDate(from)) <= Date.parse(ConvDate(to))) {
return true;
//alert("The dates are valid.");
}
else {
if (from.value == "" || to.value == "") 
{
alert("Debe ingresar ambas fechas");
return false;
}
else {
alert("La fecha desde debe ser menor que la fecha hasta!");
return false;
}
   }
}

function ValidarFecha(pFecha){ /*Formato yyyymmdd*/
	var nAno		= new Number(pFecha.substr(0,4));
	var nMes		= new Number(pFecha.substr(4,2));
	var nDia		= new Number(pFecha.substr(6,2));
	var bEsValido	= new Boolean(true);

	if (nDia < 1) {
		bEsValido = false;
	}
	if ((nMes > 12) || (nMes < 1)){
		bEsValido = false;
	}
	if ((nMes == 1 || nMes == 3 || nMes == 5 || nMes == 7 || nMes == 8 || nMes == 10 || nMes == 12) && (nDia > 31)) {
		bEsValido = false;
	}
	if ((nMes == 4 || nMes == 6 || nMes == 9 || nMes == 11) && (nDia > 30)) {
		bEsValido = false;
	}
	if (nMes == 2) {
		if (LeapYear(nAno) == true) {
			if (nDia > 29) {
				bEsValido = false;
				}
		}
		else {
			if (nDia > 28) {
				bEsValido = false;
			}
		}
	}
	return bEsValido;
}

function CompararFechas(fDesde, fHasta){
	var dFechaDesde = new Date(fDesde.substr(6,4),fDesde.substr(3,2)-1,fDesde.substr(0,2));
	var dFechaHasta = new Date(fHasta.substr(6,4),fHasta.substr(3,2)-1,fHasta.substr(0,2));
	var sRespuesta;

	if (dFechaDesde > dFechaHasta)	sRespuesta = -1;
	if (dFechaDesde == dFechaHasta)	sRespuesta = 0;
	if (dFechaDesde < dFechaHasta)	sRespuesta = 1;

	return sRespuesta;
}

function RestarAFecha(pFecha, pCantidad, pUnidad){
	var dFecha			= new Date(pFecha.substr(6,4),pFecha.substr(3,2)-1,pFecha.substr(0,2));
	var dFechaRespuesta	= new Date();

	dFechaRespuesta	= dFecha;

	if(pUnidad == 'D')
		dFechaRespuesta.setDate(dFechaRespuesta.getDate()-pCantidad);
	if(pUnidad == 'M')
		dFechaRespuesta.setMonth(dFechaRespuesta.getMonth()-pCantidad);
	if(pUnidad == 'Y')
		dFechaRespuesta.setFullYear(dFechaRespuesta.getFullYear()-pCantidad);

	return dFechaRespuesta;
}

//  End -->